Skeletal System Flashcards
How many bones does an average adult have?
206 bones
has 80 total bones, composed of the skull, auditory ossicles, in the ear, hyoid bone, vertebral column and rib cage
Axial Skeleton
consists of the pectoral girdle and the upper limb bones and has a total of 126 bones
Appendicular Skeleton
has 8 cranial vault and 14 bones in the face that sums up to 22 bones
Skull
what consist of 2 parietal bones, 2 temporal bones, Occipital bone, Sphenoid bone, Ethmoid Bone, Frontal Bone
8 Cranial bones in the skull
is when the parietal bones and occipital bone join together
Lambdoid structure
is the union between temporal, parietal and the occipital bone
Squamous suture
found in the frontal, ethmoid bones, maxillary-largest, sphenoid
Paranal Sinuses (FEMS)
major entry and exit points for blood vessels that supply the brain
foramen magnum
(shaped like a hammer), (shaped like an anvil), (shaped like a stirrup, smallest bone in the body)
Malleus, Incus, Staples
is an unpaired, U-shaped bone not part of the skull but attached to the skull
Hyoid bone
supports the weight of the head and trunk, protects spinal cord, provides a site for muscle attachment
Vertebral Column
has 26 bones 7 cervical, 5 lumbar, 12 thoracic, 1 sacral, 1 coccygeal
Vertebral Column
made up of your sternum and 12 ribs, 12 thoracic vertebrae
Rib cage
protects the heart and lungs within the thorax and forms a semighrid
Thoracic cage
“sword shape”, breastbone
Sternum
“sword handle” (handle)
Manubrium
“Blade” (body)
Gladiolus
“sword tip”
Xiphoid process
superior margin of the manubrium
jugular notch
consists of two pairs of bones that attach the upper limb into the body
Pectoral Girdle
composed of 8 carpal bones, short region between the forearm and the hand
wrist
scaphoid lunate, triquetrum, pisiform
proximal row
hamate, capitate, trapezoid, trapezium
distal row
support the body and are essential for standing, walking and running
lower limb
a ring of bone consisting of right and left hipbones and sacrum
pelvic girdle
what bone consist of three bones which are Ilium, Ischium, Pubis
Hip bone
superior portion of the ilium
Iliac crest
part of the lower limb between the knee and the ankle
leg
larger bone and supports 90% of the weight
Tibia
bone that only supports 10% of the weight
Fibula
has a total of 26 bones, 7 tarsal bones, 5 metatarsal and 14 phalanges
Foot
when bones connect or join together
joints
these are seams found only between the bones of the skull
fibrous joints
slightly moveable type of fibrous joint
syndesmosis
specialized joints consisting of pegs that fit into sockets
fibrous joints
joints that are united by means of cartilage such as hyaline or fibrocartilage
Cartilaginous Joints
contain synovial fluid, allow considerable movement between articulating bones
Synovial Joints
-occurring around one-axis
-occurring around two-axis
-occurring around any axis
Uniaxial
Biaxial
Multiaxial
“gliding joint”
plane joint
consists of two saddled-shape articulating surfaces oriented at right angles to each other so that their complementary surfaces articulate
saddle joint
Uniaxial joint in which a convex cylinder in one bone is applied to a corresponding bone
hinge joint
joint that restricts movement to rotation around a single axis
pivot joint
consists of a ball (head) at the end of one bone
ball and socket joint
a modified ball-and-socket joint, articular surfaces are ellipsoid in shape
ellipsoid joint
connective tissue of the joint becomes less flexible and the rigidity increases the rate of wear the articulating joint
aging on the joints
decreases the angle of a joint
Flexion
increases the angle of a joint
extension
the foot is moving upwards
dorsiflexion
the foot is moving downwards
plantar flexion
away from the median plane
abduction
towards the median plane
adduction
medial and lateral rotations
rotations
forearm faces down supination
pronation
circular movement of the shoulder combination
circumduction
closing the mouth
elevation
opening the mouth
depression
sticking the chin out
protraction
pulling the lower jaw backward
retraction
side to side of the mandible
excursion
opposition and reposition
thumb
what bone consist of these:
-humerus -radius -ulna -Clavicle -Metacarpals -Femur -Tibia -Fibula
long bone
what bone consist of these:
-Carpal bones which are scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, hamate
-Tarsal bones which are calcaneus, talus, navicular, cuboid, medial cuneiform, intermediate cuneiform, lateral cuneiform
short bone
what type of bone are in the cranial cavity, ribs, scapula, sternum
Flat bone
Vertebra Facial Bones
Irregular bone
formation that occurs within connective tissue membranes
Intramembranous Ossification
type of bone formation that forms primarily in the bones of the skull
Intramembranous Ossification
osteoblasts line up on the surface of connective tissue fibers and begin depositing bone matrix to form trabeculae
Intramembranous Ossification
formation of bones of the skull, mandible, and clavicle
Intramembranous Ossification
formation that occurs inside hyaline cartilage
Endochondral Ossification
forms mostly in the remaining skeletal system
Endochondral Ossification
Chondrocytes increase in number –> cartilage model to increase in size –> cartilage matrix to become calcified –> osteoblasts start forming bone
Endochondral Ossification
Primary Ossification formation
Diaphysis
Secondary Ossification formation
Epiphysis
formation of bones in the upper limb, bones of the lower limb, pelvis and the vertebra
Endochondral Ossification
List the bones in the skull and how many are there:
-Cranial
-Facial bones
Cranial there are a total of 8:
-2 parietal bones
-2 temporal bones
-1 frontal bone
-1 sphenoid bone
-1 ethmoid bone
-1 Occipital bone
Facial bones have a total of 14:
-2 Zygomatic bones
-2 Maxilla bones
-2 Palatine bones
-2 Lacrimal bones
-2 Nasal bones
-2 Inferior Nasal Conchae
-1 Mandible
-1 Vomer
List the Auditory Ossicles and how many are there
There are three bones
-Malleus
-incus
-Stapes
List the rib cage bones and how many are there
Rib cage has a total of 25 bones:
-1 sternum = breastbone
-Ribs have 12 in pairs so 24